John b



(No Model.)

J. B. WOOD;

KNOB ATTACHMENT. No. 352,942. I Patented Nov. 23, 1886,

IND/ENTER- UNITED STATES PATENT OFFICE.

JOHN B. WOOD, OF PROVIDENCE, RHODE ISLAND.

KNO B ATTACHM ENT.

SPECIFICATION forming part of Letters Patent No. 352,942, dated November 23,1886

Application filed April 12, 1886. Serial No. 198,630. (No model.)

To all whom it may concern:

Be it known that I, JOHN B. W001), of Providence, in the State of Rhode Island, have invented a new and useful Improvement in Knob Attachments, of which the following is a specification.

My invention consists in an improved device for removably securing the knob to the spindle which serves to operate the sliding to latch, as hereinafter fully set forth.

Figure 1 is a partial edge view of a door, showing the front plate of the lock, the knob and escutcheon-plate upon one side of the door being shown in section. Fig. 2 shows differcut views of the split pin which serves to secure the knob to the spindle. Fig. 3 is an enlarged section taken in the linear x of Fig. 2. In the accompanying drawings, A represents a portion of a-door, and B the lock and latch attached thereto. The. knob G is removably secured to the spindle D, which serves to operate the sliding latch E by means of the split pin F, which is provided with the enlarged ends a and b and the intermediate portion, a. The slit d divides the enlarged portion b equally and extends to the head or enlarged portion a, as shown in the side view, Fig. 2, and the so-divided enlarged portion b is cut away at opposite sides of the slit d, as shown in the top and end views, Fig. 2, in order that when the opposite prongs of the split pin F are pressed together the enlarged portion b will occupy the space indicated by the dotted lines, which is equal to the normal 5 perimeter oftheintermediate portion, c; there fore the enlarged portion b will by compression admit of being passed througha hole having the normal diameter of the intermediate portion, 0, of the pin. The holej in the spindle Dis made to fit the intermediate portion, 0, of the pin Ffas shown in Fig. 3, the head or enlarged portion a closely fitting the larger hole t in the shank e of the knob O, and the split enlargement b likewise fitting the hole t at the opposite points, ff, of the enlargement, the shoulders g and it thus formed serving to hold the pin F firmly in its position within the hole j in the spindle D. The pin Fis readily removed from the spindle D by the inward springing of the end b when the same is forcibly driven backward through the hole j.

Heretoforea small screw has been employed for securing the knob O to the spindle D; but the screw so used has been extremely liable to become loose, with consequent trouble and annoyance, and my improved split pin provides a neat and desirable means for securing the knob to the spindle in a more durable manner.

The split pin F may be made longer than shown in Fig; 2, so that the enlarged portions a and b of the same will extend beyond the periphery of the shank e of the 'knob O, and in that case the hole 25 in the shank of the knob will be made of the same size as that through the spindle D.

I am aware that it is not new to secure the knob to the latch-operatingspindle by means of a pin instead of a screw.

I claim as my invention-- The combination, with the split holdingpin provided With a cylindrical head at its solid end and a head of oval cross-section at its split end, and with an intermediate cylindrical pbrtion of less diameter than the diameter of the said heads, whereby retaining-shoulders are formed, of the laterally-perforated latch spindle and the laterally perforated knob-shank, adapted to receive and engage the heads of the holding-pin, substantially as described.

- JOHN B. WOOD. Witnesses:

SOORATES SCHOLFIELD, J OSEPH J. SCHOLFIELD. 

